Pets & animals
Feeding, weight, age and care calculations, differentiated by species and by breed size. 18 tools, including Aquarium Heater Wattage Calculator, Aquarium Substrate Calculator, Bird Cage Size Calculator and Cat age calculator. All free, with no account and nothing to install.
Aquarium Heater Wattage CalculatorFind the heater wattage your tank needs from its volume, the target water temperature and the coldest room temperature.Aquarium Substrate CalculatorWork out how much gravel, sand or aqua soil your tank needs from its shape, footprint and the substrate depth you want.Bird Cage Size CalculatorMinimum cage dimensions and safe bar spacing for eleven species, from finches to macaws, in inches and centimetres.Cat age calculatorConvert your cat's age into human years.Cat Calorie CalculatorDaily calorie needs from RER = 70·kg^0.75 and a life-stage factor, with optional cups per day.Cat Litter Box CalculatorHow many litter boxes you need (n+1, one per floor), how big each one should be, and what the litter costs you every month.Chocolate Toxicity CalculatorEstimate a dog's methylxanthine dose in mg/kg against common vet risk bands. Not veterinary advice.Dog age calculatorConvert your dog's age into human years.Dog food portion calculatorEstimate a daily dry-food portion for your dog from its weight and activity.Dog Life Expectancy CalculatorEstimate a dog's lifespan from breed, size and health-and-care factors.Dog Pregnancy CalculatorEstimated whelping date and stage from the mating date — canine gestation is about 63 days.Fish tank stocking calculatorEstimate how many fish your tank can hold using the inch-per-gallon rule.Horse Hay CalculatorDaily hay from body weight × an activity %, then flakes, bales and cost per day and month.Pet Insurance CalculatorCompare a lifetime of vet bills paid out of pocket against an insured one, year by year, with the deductible, reimbursement rate and annual cap applied.Pet Travel Crate Size CalculatorSize an airline crate for a dog or a cat with the IATA formula — length A + ½B, width 2C, height D — in both sizing systems: the US 100–700 series and the European Atlas 10–80, in inches and cm.Puppy Weight PredictorPredict a puppy's adult weight from breed, current age and current weight.Raw Feeding CalculatorDaily raw amount from a body-weight %, split into muscle meat, bone, liver and other organ.Reptile Habitat UVB CalculatorFind the right lamp-to-basking-site distance from the Ferguson zone, the lamp type and the screen mesh, with the UV index each zone targets.